Ballistic impact characteristics on the flat-nose projectile penetrating the concrete and soil compound target are studied. The deformation process and failure zone in the target are described by numerical simulation with finite element software. The results show that penetration depth, residual velocity and deceleration amplitude of flatnose projectile increase with initial velocity. The features of concrete target after impact are approximately in agreement with experimental results. And the cracks and the tensile crush zone formed during penetration could characterize the damage and failure of target. Meanwhile, terminal ballistic characteristics of flat-nose projectile into single soil layer are studied to compare with that of concrete compound target. The results show that the overload of projectile penetrating hard-soil is only one-third of that of concrete compound target with low velocity. Reversely, the duration of the former is more than five times as long as the latter, and the rebound velocity of projectile penetrating soil medium is greater than the concrete compound target.

The similarity and conditions for the similarity of deformation dynamic response of thin circular plates subjected to blast and impact loadings under certain conditions were studied by experimental tests and numerical simulation using air explosion and drop hammer impact loadings. The results revealed that the final deformed shapes of thin plates subjected to the two dynamic loadings are similar with less than 2 % difference in deflection and less than 8 % difference in deformed volume. The deformation similarity of plates subjected to blast and impact loadings can be achieved as the shock dimensionless number and the hammer shape satisfying given features. The deformation responses of the thin plates satisfying the constraints to blast and impact loadings are opposite. The key parameters of the blast and impact loading systems were obtained by the dimensional analysis using Buckingham π theorem. Based on these results, a similarity scheme was proposed. The numerical simulation was verified with the experimental results. In all, a novel method was established to study the similitude of analogous systems, which could be extended to other similar physical problems.